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April 20, 2014

Homework Help: Chemistry question!

Posted by Riel on Saturday, August 8, 2009 at 9:43am.

Please help!

What do both an atom and an ion of the isotope of sodium, Na, contain?

a) 11 electrons
b) 12 neutrons
c) 23 protons
d) 23 neutrons

I really don't get the question. Ok, firstly, choice c and d are out, because it is the RMM of Na that is 23, not the number of neutrons or protons.
Then for choice a, an atom of Na has 11 electrons, but an ion of the isotope of Na wouldn't have 11 electrons, since it's an atom, right? But choice b is weird as well, because an atom of Na will have 12 neutrons, but an isotope wouldn't isnt it? Because isotopes have the same number of protons and electrons but different number of neutrons right???

So what is this question????

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